SSH EN 302 094-1 V1.1.3:1999

Integrated Services Digital Network (ISDN); Digital Subscriber Signalling System No. one (DSS1) and Signalling System No.7 (SS7) protocols; Call Forwarding on Not Reachable (CFNRc) supplementary service for Cordless Terminal Mobility (CTM) phase 1; Part 1: Protocol specification

Scope

The present document specifies the stage 3 of the Signalling application for the mobility management service for the
phase 1 of Call Forwarding on Not Reachable (CFNRc) supplementary service. The mobility management service
functions include Cordless Terminal Mobility (CTM) for CTM phase 1 (DECT/GAP limitation) and DECT access to
GSM via an ISDN user-network interface at the T reference point or coincident S and T reference point (as defined in
ITU-T Recommendation I.411 [4]) by means of the Digital Subscriber Signalling System No. one (DSS1) protocol.
Stage three identifies the protocol procedures and switching functions needed to support a telecommunication
service (see CCITT Recommendation I.130 [2]).
The Call Forwarding on Not Reachable (CFNRc) supplementary service enables a served user to have the network
redirect to another user calls which are addressed to the served user's ISDN number. After the Call Forwarding on Not
Reachable (CFNRc) supplementary service has been activated, calls are forwarded only if the served user's cordless
terminal is not reachable. The Call Forwarding on Not Reachable (CFNRc) supplementary service operates on all calls.
The served user's ability to originate calls is in principle unaffected by the Call Forwarding on Not Reachable (CFNRc)
supplementary service.
NOTE: Practically the served user's ability to originate calls is affected if there is radio congestion or if the served
user's cordless terminal is for example out of radio coverage.
The signalling application for phase 1 describes the mobility management procedures required to allow users of cordless
terminals to be mobile within and between networks. Whenever radio coverage is provided and the cordless terminal has
appropriate access rights, the user is able to make calls from and to receive calls at any location within the network.
The signalling application for phase 1 is applicable to the telephony 3,1 kHz teleservice (ETS 300 111 [19]), speech
bearer service (ETS 300 109 [17]) and 3,1 kHz audio bearer service (ETS 300 110 [18]).
Further parts of EN 302 094 specify the method of testing required to identify conformance to the present document.
The present document is applicable to equipment supporting the signalling application for the alpha interface or the beta
interface, to be attached at either side of a T reference point and coincident S and T reference point when used as an
access to the public ISDN or GSM.